Rear suspension problem after minor repair - Consumer Complaint for Ford Philippines

2014 ford ecosport with 20k mileage with no suspension issues. Went for a pm and software upgrade last jan.9,2021 at ford makati.they suggested to replace a rear coil spring insulator.afterwards, rear suspension unstable comparable to going horse back riding. Went back to complain and have a backjob. Now they want to replace the rear shocks.